Is there a reason JavaScript developers don’t use Array.push()?

by

I actually asked myself the same question at the start of this year. UPDATED with new test cases http://jsperf.com/array-push-vs-unshift-vs-direct-assignment/2

It appears that push is much faster in chrome, and about equal in FF. Also direct is faster in IE9, but I would be interested to see how it performs in IE10.

I would say that most developers would assume setting the length of the array, and then using direct assignment is faster, as is the case with most programming languages. But JavaScript is different. Javascript arrays aren’t really arrays, they’re just key/value maps just like all other JavaScript objects. So the pre-allocation is essentially falling on deaf ears.

Personally I prefer push (:

More Related Contents:

  1. setState doesn’t update the state immediately
  2. Does ES6 introduce a well-defined order of enumeration for object properties?
  3. How to convert decimal to hexadecimal in JavaScript
  4. How can I determine the direction of a jQuery scroll event?
  5. How to get function parameter names/values dynamically?
  6. How to check if a variable is an integer in JavaScript?
  7. Function in JavaScript that can be called only once
  8. How to calculate md5 hash of a file using javascript
  9. How to prevent Unicode characters from rendering as emoji in HTML from JavaScript?
  10. How to find indices of all occurrences of one string in another in JavaScript?
  11. How to detect window.print() finish
  12. (Deep) copying an array using jQuery [duplicate]
  13. How do I clear the content of a div using JavaScript? [closed]
  14. Access my entire browsing history via Javascript
  15. JavaScript ‘in’ operator for `undefined` elements in Arrays
  16. Can I use arrow function in constructor of a react component?
  17. jQuery Deferred and Dialog box
  18. Waiting for child window loading to complete
  19. javascript – remove array element on condition
  20. Javascript Code works in jsfiddle and but not in the Browser [closed]
  21. Node.js: SyntaxError: Cannot use import statement outside a module
  22. Is “localStorage” in Firefox only working when the page is online?
  23. How to unbind a specific event handler
  24. How to prevent direct access to my JSON service?
  25. Function.prototype is a function
  26. Dynamically Rendering a React component
  27. Regex JavaScript image file extension [closed]
  28. Performance penalty of creating handlers on every render with react-hooks
  29. How to get read data from response header in jquery/javascript [duplicate]
  30. Owl Carousel Won’t Autoplay

Leave a Comment